Should you avoid eating preserved foods?

Preserved or proessed and canned foods usually use salt and other ingredients we are not familiar with. Salt-preserved or high-salt foods may increase our risk of cancers of the stomach and nasopharynx, the bit where the back of our nose meets our throat. It is unlikely that table salt used in cooking or flavouring will strongly influence our risk of cancer. But too much salt can increase our blood pressure and our risk of heart disease and stroke. Doctor's advice: Try not to eat too many salt-preserved or high-salt foods. And check the salt content of processed foods and ready meals. There is often salt hidden where you wouldn't expect it and you may not be able to taste it if the foods are also high in sugar. We must be aware of these labels because of the risk of contamination and health hazards. As to guar gum, I think it is of plant derivative and is used as stabilizer and emulsifier in proessed foods. While I don't know how the Plaster of Paris can be used as a food preservative but I am sure they are wood preservatives.